watts hy-420 vacuum breaker

Instead, a spring-assisted silent check valve is the ideal choice. In vertical piping the easiest thing to do is replace the swing check or double door valve with an inline, axial flow-style check valve. Only axial flow silent check valves perform well in vertical piping locations, as these valves rely on potential energy from a spring to close rather than on water pressure. This means that the valve will close on its own before any backed-up fluid can force its way back up into the piping.

HY-420-CIA Repair Kit

There are many different requirements when designing fluid flow systems and installing the correct check valves for the application. Not all styles of check valves function properly or are suitable for vertical flow directions. When installing a check valve, a horizontal line is always preferred, because it takes gravity out of the equation.

Watts HY-420 parts breakdown

The most difficult flow direction to address is vertical flow down. This flow direction is most often found in boiler supply lines and mining applications, where space is limited. A swing check valve will not work in this position as it will always be open and not doing its job.

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If the flow in the vertical line is going upwards (against gravity), gravity will cause the disc to slam against the seat when the flow stops or a pump shuts down, leading to potentially severe water hammer. All that shock can be avoided with a DFT silent check valve.

As economic growth rises, so does the demand for natural gas. The infrastructure for natural gas in power plants should keep up with the unique challenges posed by power production and distribution. For instance, the need for gas compression and metering facilities in the Utica and Marcellus Shale regions has increased dramatically in the last… Read More

hy-420-cia watts

watts hy-420 repair instructions pdf

DFT® Check Valves come in a large variety of styles, such as wafer, flanged, butt weld, and NPT. They are also available in a host of alloys and can be customized for most applications. Contact DFT for more information on which valve is appropriate for your specific piping design.

The stronger spring of the axial flow valve will ensure that the valve closes before any reverse flow happens. Closing the valve before flow reverses will also eliminate most water hammer, which is the primary advantage of axial flow check valves.

Watts HY-420 pdf

However, in real-world applications, the ideal situation is not always available. There are numerous applications where vertical runs are needed to move fluids either vertically up or down – such as within buildings, mine shafts, towers, etc. – for applications such as mine dewatering, sump pumps, and many others.

This Watts Drains non-freeze, key operated wall hydrant features a chrome plated face, an integral vacuum breaker, all bronze head, seat casting, wall casing and internal working parts, and a loose key. It has a 3/4 inch MIP hose connection, 3/4 inch FIP by 1 inch MIP pipe connection, a 125 psi maximum operating pressure and is designed to fit a 12 inch wall.

Watts 8151594 - HY-420-12-LF 12" Lead Free Non-Free Wall Hydrant with Vacuum Breaker, Key Operated, Bronze Body, Chrome Plated Face.

Whether it is used vertically or horizontally, DFT® can custom size a check valve to the unique requirements of your application. Given the known specifications of fluid type, specific gravity, pressure, flow rate, temperature, and more, we can custom engineer the check valve to suit your application.